html 目录结构

"D:\phpStudy\WWW\tubiao\libchart\libchart\classes\view\chart/../../../images/PoweredBy.png"

D:\phpStudy\WWW\tubiao\libchart\libchart\classes\view\chart/../../../
表示当前chart目录向上追溯3层，进入

D:\phpStudy\WWW\tubiao\libchart\libchart目录

再由以上目录进入

images/PoweredBy.png